DC FSMO Roles

I want to make sure that if my primary site is down and I need to rely on my DC2 at the DR site the FSMO roles are sync'ed or transferred over. Is this an automatic feature or manual? I need to make sure everything will work if my DC1 at my primary site if down.

there is no such thing as sync or automatic transfer of FSMO roles, or not that I know of.
Those roles will either move automatically if you demote a DC that is holding those roles, or you can manually transfer them to new DC.
In your case, if DC holding those roles goes down, you can either w8 for that DC to goes online, or seizing it, in case that primary DC is not gona be up.

PS: Most of things should work, without FSMO holder, in some sort amount of time. You wont be able to extend schema, join new pc to domain, rename domain, sync time..or do some other stuff.. but people should be able to login, work, etc.. Depends of company, maybe you should test it, before it happends :)

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